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Water stains, moss and dirt can ruin the look of an exterior concrete wall. Whether the wall is part of a building or a part of the landscape design, keeping it clean can improve the entire appearance of your property. The permeable surface of concrete absorbs staining agents, so water and scrubbing alone won't work all the dirt out of the porous concrete. A thorough cleaning with a concrete-safe cleanser lightens stains and usually removes them completely.

1

Spray the entire wall with water to rinse off dust and dirt. Spray the wall as necessary while cleaning it so the concrete surface remains moist.

2

Dissolve 1/2-ounce of trisodium phosphate (TSP) in a gallon of hot water in a large bucket. Alternatively, use 2 ounces of washing soda instead of TSP.

3

Put on a pair of rubber gloves and wear eye protection. The cleaning chemicals can cause skin and eye irritation.

4

Dip a stiff scrub brush into the TSP solution. Scrub the entire concrete wall surface with the TSP. Replace the solution with fresh when it becomes dirty.

About the Author

Jenny Harrington has been a freelance writer since 2006. Her published articles have appeared in various print and online publications. Previously, she owned her own business, selling handmade items online, wholesale and at crafts fairs. Harrington's specialties include small business information, crafting, decorating and gardening.